Efficacy of new amorphous silica dust, Dryacide, against Sitophilus granarius (L.) (Coleoptera: Curculionidae) infesting stored wheat grains [electronic resource].

Includes references.

Amorphous silica dust (Dryacide) was used to control adults of Sitophilous granarius at concentrations of 200, 400, 600,800 and 1000 µg silica dusVg wheat. Adults of S. granarius were placed in the three classes of wheat grains (hard, soft & durum)and incubated at 20°C and 28 ± 1 °C and 65 :t 5 % R.H. Mortality counts were estimated after 48 and 168 hrs. Toxicity increased with increase lower concentration and temperature. Percent reduction of progeny reached 66.66 - 75.0 % in some wheat classes. Silica dust gave high percentages of mortality after long-term storage at the fout periods (1, 8. 16, and 24 weeks) at 500 and 1000 µg/g w. Seed germination was not affected by treatment by silica dust.

Summary in Arabic.

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